Unit pixel of CMOS image sensor

Details Unit pixel of CMOS image sensor Unit pixel of CMOS image sensor

2006-07-17

2008-03-25

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C348S243000, C348S308000, C257S292000

Reexamination Certificate

active

07348533

ABSTRACT:
In a unit pixel of a CMOS image sensor which compensates for a dark current generated in a photo diode to enhance its driving range, the photo diode generates a charge in accordance with a received light amount. A drive transistor has a gate for receiving the charge in the photo diode to output as an electrical signal, and a drain to which a power voltage is applied. A saturation detector receives a gate voltage of the drive transistor and judges the drive transistor saturated if an output voltage is smaller than a preset reference voltage. A switch connects or disconnects between the power voltage and the gate of the drive transistor in response to the judgment of the saturation detector.

REFERENCES:
patent: 6246043 (2001-06-01), Merrill
patent: 2006/0146161 (2006-07-01), Farrier

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